Powerplant (Engines) Flashcards
Time limit for takeoff trust
5min
Maximum N1
106%
Maximum N2
105%
Max EGT takeoff
930 degrees C (940 degrees C 20sec transient)
Max cont EGT
895 degrees C
Max start
725 degrees C
Min oil psi
13
Max oil temp
165 degrees C
165-160 degrees C (15 min)
Max continuous oil temp
160 degrees C
Continuous engine ignition must be on for
Take off, landing and engine anti-ice on
Minimum start pneumatic psi
30 (- .5psi per 1000ft AMSL)
The PMC makes fuel flow adjustments to the MEC by monitoring
- Thrust lever angle
- Inlet Temp and pressure
- N1 RPM
Thrust reverser light indicates
- A disagreement between selector valve and isolation valve
- If one or two reverser levers are not in the commanded position
- Auto restow system has been activated
- Any other time a malfunction has occurred
If the reverser light is on for more then 12sec what will illuminate
The MASTER CAUTION and ENG annunciation lights. The delay allows time for completion of the normal stowing cycle
What is PMC doing in the on position
The PMC is providing a signal to the MEC to modify N1 for better control of thrust settings (compensates for variations in inlet temp and pressure
Low idle light indicates
Insufficient engine RPM (less than 25% inflight)
Low idle light is prevented from illuminating when
- Air/ground logic senses on ground condition
- Engine start lever in cutoff position
The PMC also provides
- Smooth acceleration
- minimal EGT overshoot
- limited overspeed protection
The PMC is powered by
The N2 speed sensor which is an AC generator
With the PMC off during takeoff
Engine RPM may increase as speed increases (may be as much as 7%)
The two idle speeds are
Low approx 22% N1
High approx 32% N1
High idle is used when
For all stages of flight
High idle switched to low idle
4 sec after touchdown (delay to enhance engine acceleration for reverse thrust)
With a normal electrical failure the engine idle speed does what
Automatically goes to High idle (held in low idle with a solenoid)
